[Rpm-maint] [rpm] Add lua function posix.close (#44)

[Zbigniew Jędrzejewski-Szmek]

```
   if (!have_forked)
           return luaL_error(L, "exec not permitted in this context");
   fd = open('/dev/null', 'w');
   if (fd == 2)
           return pushresult(L, 1, NULL);
   r = dup2(fd, 2);
   e = errno;
   close(fd);
   errno = e;  
   return pushresult(L, r, NULL);
```


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https://github.com/rpm-software-management/rpm/pull/44#issuecomment-191388866
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